It is dangerous _______ the children _______ play near the deep water.[ ]

A. to;  of                

B. to;  for                

C. of;  to                

D. for;  to

自动取样器取时间比例样时的一次取样量为（）mL。

A.0.5～1.0

B.3～5

C.1.0～1.5

D.1.5～3.0